Production method for producing 15 Cr colorful alloy steel plate through calcium-free chromium slag

Abstract

The invention discloses a production method for producing a 15 Cr colorful alloy steel plate through calcium-free chromium slag. The production method for the 15 Cr colorful alloy steel plate comprises the following steps that A, solid waste produced through a chemical engineering chromium salt production line is utilized, carbon serves as a reducing agent for smelting in an electric furnace, andchromium containing cast iron is obtained; B, the chromium containing cast iron and dephosphorized molten steel are subjected to carbon reducing and chromium conservation refining in a converter, anda blank is formed through pouring; C, a 15 Cr alloy steel plate is produced through the hot rolling and cold rolling technology process; D, grinding polishing and roughening treatment is conducted onthe surface of the 15 Cr alloy steel plate; E, color generation elements and active elements are added in a hot-dip 15 Cr solution; and F, the steel plate is placed in the solution to be subjected tohot dipping. According to the production method, the calcium-free chromium slag produced on a calcium-free roasting production line serves as a main raw material for producing the 15 Cr colorful alloysteel plate, on one hand, secondary utilization of scarce resources is achieved, on the other hand, zero emission of solid waste produced in chemical engineering is achieved, and the purpose of circular economy is achieved.

Description

technical field [0001] The invention relates to the technical field of 15Cr colored alloy steel plates, in particular to a production method for producing 15Cr colored alloy steel plates with calcium-free chromium slag. Background technique [0002] The chemical symbol of chromium is Cr, which is a silvery-white lustrous metal. Pure chromium has ductility, and chromium containing impurities is hard and brittle, with a density of 7.20g / cm3. It is soluble in strong alkali solution. Chromium has high corrosion resistance. In the air, even in the red hot state, the oxidation is very slow. Plating on the metal can play a protective role. Chromium can slowly dissolve in dilute hydrochloric acid and dilute sulfuric acid to form a blue solution, which is compatible with air Contact will quickly turn green, because it is oxidized to green Cr2O3 by oxygen in the air. 15Cr is a commonly used low-carbon alloy carburizing steel, which can significantly increase the carbon content on the...

AI Technical Summary

Problems solved by technology

15Cr is a commonly used low-carbon alloy carburizing steel, which can significantly increase the carbon content on the surface and increase the carburizing depth during carburizing. It is mainly used to manufacture high-speed and small-section (≤30mm), but Carburized parts that require high strength and toughness at the core and wear-resistant surfaces, such as gears, cams, slide valves, pistons, bushes, crank pins, piston pins, piston rings, couplings, shafts, bearing rings, etc. , this kind of steel can also be used as a low-carbon martensitic quenched steel to manufacture parts that do not require strict deformation but require strength and toughness. my country is a country with extremely poor chromium resources. Chromium is a strategic resource. The chromium element added to the material is mainly provided by imported chromium ore powder (part of which is chromium ore) and ferrochrome smelted in an electric furnace. However, a large amount of calcium-free chromium slag will be produced in the calcium-free roasting production line, which is not only wasted At the same time, the discharge of waste residues also increases the degree of pollution to the environment, which is not in the interests of enterprises and the country

Images